[jira] [Created] (JENA-939) Regression - incorrect rewriting of bnodes

["Alan Ruttenberg (JIRA)" <ji...@apache.org>]

Alan Ruttenberg created JENA-939:
------------------------------------

             Summary: Regression - incorrect rewriting of bnodes
                 Key: JENA-939
                 URL: https://issues.apache.org/jira/browse/JENA-939
             Project: Apache Jena
          Issue Type: Bug
          Components: ARQ
    Affects Versions: Jena 3.0.0
         Environment: OSX up-to-date latest JAVA
            Reporter: Alan Ruttenberg


This is building from the github project HEAD  -https://github.com/apache/jena/tree/c51aa08005de96cfc8230f6fd43fae51bb30cabd

Using qparse , for input below, you get error when qparse tries to reparse what it generated. BTW, it would be nice to maintain use-assigned bnode names, for easier debugging, and in order to use qparse for pretty-printing. 

{code}
select ?s  ?p where
   { {select * where {?s ?p _:blank}}
     ?s ?p _:blank2
   }

-> 

SELECT  ?s ?p
WHERE
  { { SELECT  *
      WHERE
        { ?s ?p _:b0}
    }
    ?s ?p _:b0
  }


**** Check failure: could not parse output query
org.apache.jena.query.QueryParseException: Line 7, column 11: Blank node label reuse not allowed at this point: _:b0
	at org.apache.jena.sparql.lang.ParserBase.throwParseException(ParserBase.java:554)
	at org.apache.jena.sparql.lang.ParserBase.createBNode(ParserBase.java:360)
	at org.apache.jena.sparql.lang.sparql_11.SPARQLParser11.BlankNode(SPARQLParser11.java:4881)
	at org.apache.jena.sparql.lang.sparql_11.SPARQLParser11.GraphTerm(SPARQLParser11.java:3390)
	at org.apache.jena.sparql.lang.sparql_11.SPARQLParser11.VarOrTerm(SPARQLParser11.java:3278)
	at org.apache.jena.sparql.lang.sparql_11.SPARQLParser11.GraphNodePath(SPARQLParser11.java:3234)
	at org.apache.jena.sparql.lang.sparql_11.SPARQLParser11.ObjectPath(SPARQLParser11.java:2750)
	at org.apache.jena.sparql.lang.sparql_11.SPARQLParser11.ObjectListPath(SPARQLParser11.java:2731)
	at org.apache.jena.sparql.lang.sparql_11.SPARQLParser11.PropertyListPathNotEmpty(SPARQLParser11.java:2664)
	at org.apache.jena.sparql.lang.sparql_11.SPARQLParser11.TriplesSameSubjectPath(SPARQLParser11.java:2608)
	at org.apache.jena.sparql.lang.sparql_11.SPARQLParser11.TriplesBlock(SPARQLParser11.java:1792)
	at org.apache.jena.sparql.lang.sparql_11.SPARQLParser11.GroupGraphPatternSub(SPARQLParser11.java:1775)
	at org.apache.jena.sparql.lang.sparql_11.SPARQLParser11.GroupGraphPattern(SPARQLParser11.java:1675)
	at org.apache.jena.sparql.lang.sparql_11.SPARQLParser11.WhereClause(SPARQLParser11.java:431)
	at org.apache.jena.sparql.lang.sparql_11.SPARQLParser11.SelectQuery(SPARQLParser11.java:124)
	at org.apache.jena.sparql.lang.sparql_11.SPARQLParser11.Query(SPARQLParser11.java:29)
	at org.apache.jena.sparql.lang.sparql_11.SPARQLParser11.QueryUnit(SPARQLParser11.java:20)
	at org.apache.jena.sparql.lang.ParserSPARQL11$1.exec(ParserSPARQL11.java:48)
	at org.apache.jena.sparql.lang.ParserSPARQL11.perform(ParserSPARQL11.java:97)
	at org.apache.jena.sparql.lang.ParserSPARQL11.parse$(ParserSPARQL11.java:52)
	at org.apache.jena.sparql.lang.SPARQLParser.parse(SPARQLParser.java:34)
	at org.apache.jena.query.QueryFactory.parse(QueryFactory.java:147)
	at org.apache.jena.query.QueryFactory.create(QueryFactory.java:79)
	at org.apache.jena.sparql.util.QueryUtils.checkParse(QueryUtils.java:98)
	at org.apache.jena.sparql.util.QueryUtils.checkQuery(QueryUtils.java:38)
	at arq.qparse.exec(qparse.java:165)
	at arq.cmd.CmdMain.mainMethod(CmdMain.java:99)
	at arq.cmd.CmdMain.mainRun(CmdMain.java:60)
	at arq.cmd.CmdMain.mainRun(CmdMain.java:47)
	at arq.qparse.main(qparse.java:62)
SELECT  ?s ?p
WHERE
  { { SELECT  *
      WHERE
        { ?s ?p _:b0}
    }
    ?s ?p _:b0
  }
{code}



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